#include <stdio.h>
int main()
{
    int year,leap;
    printf("enter year:");
    scanf("%d",&year);
    if (year%4==0)
    {
        if(year%100==0)
        {
            if(year%400==0)
                leap=1;
            else leap=0;
        }
        else leap=1;
    }
    else leap=0;
    if(leap)
        printf("%d is ", year);
    elseprintf("%d is not", year);
    printf("a leap year.\n");
    return 0;
}